Please Help! - High Level Programming

laila63 · #1 07-29-2004

I'm trying to comple this small program to waste CPU usage. The code is as follow:

Code:

#include <time.h>

#define SLEEPTIME 5

time_t start, end;
start=time(NULL);
end=start+SLEEPTIME;

while(end > start){
     start=time(NULL);
}

and i got the following errors:

Code:

 g++ waste.cpp
waste.cpp:6: error: ISO C++ forbids declaration of `start' with no type
waste.cpp:6: error: conflicting types for `int start'
waste.cpp:5: error: previous declaration as `time_t start'
waste.cpp:7: error: ISO C++ forbids declaration of `end' with no type
waste.cpp:7: error: conflicting types for `int end'
waste.cpp:5: error: previous declaration as `time_t end'
waste.cpp:9: error: syntax error before `while'

what could be wrong? if there's a better way to do this, please suggest.
Thank you much!

norsk hedensk · #2 07-29-2004

declare your variables.

jim mcnamara · #3 07-29-2004

I think the compiler is confused - your code, as posted, looks reasonable. It looks like the compiler has already seen start referenced before. start is not a reserved word in C++. It also looks like variables are declared.

try something like this:

Code:

#include <time.h>

#define SLEEPTIME 5

time_t start=time(NULL);
time_t end=start+SLEEPTIME;

while(end > start){
     start=time(NULL);
}

laila63 · #4 07-29-2004

Quote:

Originally posted by jim mcnamara
I think the compiler is confused - your code, as posted, looks reasonable. It looks like the compiler has already seen start referenced before. start is not a reserved word in C++. It also looks like variables are declared.

try something like this:

Code:

#include <time.h> #define SLEEPTIME 5 time_t start=time(NULL); time_t end=start+SLEEPTIME; while(end > start){ start=time(NULL); }

Thanks for your suggestion, but i got 1 error this time when compling the above code:
try.cpp:8: error: syntax error before `while'

could it be that SLEEPTIME is of int type and assigning to time_t variable is illegal?

laila63 · #5 07-29-2004

As always, thank you so much Driver!
Yes, I am a newbie and still learning by way through trying out different applications.
I just wanted a small program to waste cpu and yes portability a concern here. But i'll take up on your suggestion on trying it out with sleep()

Cheers!

jim mcnamara · #6 07-29-2004

Ooooops. I assumed that was a snippet, not the whole thing...
All C, C++ code requires main() somewhere. That's the place where the program starts running.

norsk hedensk · #7 07-30-2004

Quote:

Oh, and by the way, time_t is an arithmetic type.

oooh i see. i didnt know that

its been a while since ive played with c.

and as stated before, you need the main() function.

i thought it was just a "snippet" also.

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